diff --git a/Mac/MainWindow/Detail/DetailWebView.swift b/Mac/MainWindow/Detail/DetailWebView.swift
index 3fd16cb5e..9c7a618b9 100644
--- a/Mac/MainWindow/Detail/DetailWebView.swift
+++ b/Mac/MainWindow/Detail/DetailWebView.swift
@@ -65,6 +65,7 @@ final class DetailWebView: WKWebView {
 		
 	private var inBigSurOffsetFix = false
 	
+	@available(macOS, obsoleted: 12, message: "when minimum deployment > macOS 11 remove bigSurOffsetFix() and calls to it.")
 	private func bigSurOffsetFix() {
 		/*
 		On macOS 11, when a user exits full screen
@@ -73,25 +74,30 @@ final class DetailWebView: WKWebView {
 		
 		This code adjusts the height of the window by -1pt/+1pt,
 		which puts the webview back in the correct place.
+		 
+		This code is only executed if currently running on macOS 11
 		*/
-		guard var frame = window?.frame else {
-			return
-		}
-
-		guard !inBigSurOffsetFix else {
-			return
-		}
 		
-		inBigSurOffsetFix = true
-		
-		defer {
-			inBigSurOffsetFix = false
+		if #unavailable(macOS 12) {
+			guard var frame = window?.frame else {
+				return
+			}
+			
+			guard !inBigSurOffsetFix else {
+				return
+			}
+			
+			inBigSurOffsetFix = true
+			
+			defer {
+				inBigSurOffsetFix = false
+			}
+			
+			frame.size = NSSize(width: window!.frame.width, height: window!.frame.height - 1)
+			window!.setFrame(frame, display: false)
+			frame.size = NSSize(width: frame.width, height: frame.height + 1)
+			window!.setFrame(frame, display: false)
 		}
-
-		frame.size = NSSize(width: window!.frame.width, height: window!.frame.height - 1)
-		window!.setFrame(frame, display: false)
-		frame.size = NSSize(width: window!.frame.width, height: window!.frame.height + 1)
-		window!.setFrame(frame, display: false)
 	}
 }